This longer collar was designed for use on MK12 Mod 1 rifles. It has an internal step that interfaces with a step in MK12 barrels that prevents rearward movement. The set screw, typically positioned on the bottom prevents rotation.

UPC
MFG Allen Engineering
MODEL MK12 MOD 1 SPR Collar
TITLE Allen Engineering MK12 MOD 1 SPR Collar

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